A man has died at the scene after a B-double truck crossed into oncoming traffic on the Hume Highway on Saturday.
Police report the incident occurred shortly before 4am near the Medway Road off ramp, near Berrima, in the New South Wales Southern Highlands.
A crime scene was established after emergency services were alerted to the accident in the south bound lanes.
A man has died at the scene after a B-double truck crossed into oncoming traffic on the Hume Highway on Saturday
A crime scene was established after emergency services were alerted to the accident in the south bound lanes
Police believe that a north bound semi-trailer crossed to the south bound lanes of the highway and collided with several vehicles, causing a huge pile-up.
A passenger in a white utility that was hit by the truck was trapped in his vehicle and could not be revived.
Officers from the Metropolitan Crash Investigation Unit continue to investigate the circumstances surrounding the crash.
Police have urged anyone who witnessed the crash, or with dash cam footage of the events leading up to it, to come forward.
The southbound lanes of the Hume Highway remain closed with all traffic being diverted onto Medway Road.
Motorists are urged to avoid the area, delay their trip or find an alternate route if possible.
Police believe that a north bound semi-trailer crossed to the south bound lanes of the highway and collided with several vehicles
Motorists are urged to avoid the area, delay their trip or find an alternate route if possible (pictured: the semi-trailer following the crash)
The fatal accident comes just three days after another semi-trailer slammed into a guard rail, before falling off a bridge and bursting into flames.
The incident occurred on the Wingecarribee Bridge in Berrima, just near Saturday’s fatal accident.
The truck fell halfway off the bridge and burst into flames as driver Greg Baker, 62, narrowly escaped.